If you wanted to have a model consist of, say, a K4, a heavyweight baggage car and 4-5 MP54 unpowered trailers with their pans down, I don't see why not. Long as the MP54s are behind the heavyweights, it would work. I don't know of any occasion this occurred in real life, but it could have, I suppose. Such a consist might have required a generator car as well to run the lights and such on the MP54s...
Mitch